Figure 7.

Expression Patterns of the At3g25810 Promoter–GUS Fusion Gene during Flower Development.

GUS staining was observed in sepals, stigmas, anther filaments, and receptacles of mature, but not immature, buds (A), newly opened flower (B), and older flower (C). In (D), petals and sepals were removed to show clearly the staining in the stigma of the older flower. The newly opened flower (B) is in the protogynous stage, in which the receptive stigma, protruding above the petals and the immature anthers, is accessible to cross-pollination. The older flower (C) is in the autogamous stage, in which the stamens have elongated to the level of the stigma and dehisced. The proximity of the stamens to the stigma at this stage facilitates self-pollination.